I had the PWM running a set of LEDs on my Matrix Orbital LK202-24-USB working perfectly.

As the project has been a work in progress I has not connected up the LCD in a while.
Now the PWM does not work at all.
The outputs switch on at power up, but will not turn off in test mode or by the events ...

What types of fans are you running?
(Do they draw more then 1 amp)

On the CCFL's are you using PWM outputs on the HPO?
CCFL inverters do NOT like PWM voltage, they are not designed to run off lower then +12volts. (Basicly you can't dim most CCFLs without damange)

I am offering my schematic up for anyone to pruse through.
(Educational, Non-Commercial use only!)

Sorry for no actual values on components. This circuit is untested.
I won't do too much explaining, you can either read it, or you can't.
If you notice a screw-up though, please tell me.

http://www ...

I found some SIP REED relays that will be tiny and perfect to run the keypad.
------
Am I correct that the High Power GPO's can PWM LEDs without extra circuitry?
(Due to a firmware upgrade)

I would like to use the PWM output to run three seperate banks of LEDs.
Each bank will have around 24 LEDs ...

Thanks for the super fast response.

I will have to do some experimenting then.
It sounds like a transitor may work.
Worst case I need to find some very small relays.

Also I think I will also wire two of my hard-wired buttons into the display, that way I can have the LCD display and event to go ...

I want to utilize my LK202-24-USB-GW keypad interface to it's upmost potential.

But my project will be using touch-sensative buttons.
These are driven by QTouch IC's. www.Qprox.com
The IC's can output either Active High or Active Low.

How can I interface these into the matrix keypad inputs?

More ...